var GPS = {
  PI: 3.14159265358979324,
  x_pi: (3.14159265358979324 * 3000.0) / 180.0,
  transformLat: function (x, y) {
    var ret =
      -100.0 +
      2.0 * x +
      3.0 * y +
      0.2 * y * y +
      0.1 * x * y +
      0.2 * Math.sqrt(Math.abs(x));
    ret +=
      ((20.0 * Math.sin(6.0 * x * this.PI) +
        20.0 * Math.sin(2.0 * x * this.PI)) *
        2.0) /
      3.0;
    ret +=
      ((20.0 * Math.sin(y * this.PI) + 40.0 * Math.sin((y / 3.0) * this.PI)) *
        2.0) /
      3.0;
    ret +=
      ((160.0 * Math.sin((y / 12.0) * this.PI) +
        320 * Math.sin((y * this.PI) / 30.0)) *
        2.0) /
      3.0;
    return ret;
  },
  transformLon: function (x, y) {
    var ret =
      300.0 +
      x +
      2.0 * y +
      0.1 * x * x +
      0.1 * x * y +
      0.1 * Math.sqrt(Math.abs(x));
    ret +=
      ((20.0 * Math.sin(6.0 * x * this.PI) +
        20.0 * Math.sin(2.0 * x * this.PI)) *
        2.0) /
      3.0;
    ret +=
      ((20.0 * Math.sin(x * this.PI) + 40.0 * Math.sin((x / 3.0) * this.PI)) *
        2.0) /
      3.0;
    ret +=
      ((150.0 * Math.sin((x / 12.0) * this.PI) +
        300.0 * Math.sin((x / 30.0) * this.PI)) *
        2.0) /
      3.0;
    return ret;
  },
  // 坐标转换
  delta: function (lat, lon) {
    var a = 6378245.0; // a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
    var ee = 0.00669342162296594323; // ee: 椭球的偏心率。
    var dLat = this.transformLat(lon - 105.0, lat - 35.0);
    var dLon = this.transformLon(lon - 105.0, lat - 35.0);
    var radLat = (lat / 180.0) * this.PI;
    var magic = Math.sin(radLat);
    magic = 1 - ee * magic * magic;
    var sqrtMagic = Math.sqrt(magic);
    dLat = (dLat * 180.0) / (((a * (1 - ee)) / (magic * sqrtMagic)) * this.PI);
    dLon = (dLon * 180.0) / ((a / sqrtMagic) * Math.cos(radLat) * this.PI);
    return { lat: dLat, lon: dLon };
  },
  // 判断是否为国外坐标
  outOfChina: function (lat, lon) {
    if (lon < 72.004 || lon > 137.8347) {
      return true;
    }
    if (lat < 0.8293 || lat > 55.8271) {
      return true;
    }
    return false;
  },
  // GPS---高德  注意经纬度位置
  gcj_encrypt: function (wgsLat, wgsLon) {
    if (this.outOfChina(wgsLat, wgsLon)) {
      return { lat: wgsLat, lon: wgsLon };
    }
    var d = this.delta(wgsLat, wgsLon);
    return { lat: wgsLat + d.lat, lon: wgsLon + d.lon };
  },
};

export default GPS;
